How do you earn a metal in Medabots Ax Metabee Version

To get a metal. You have to beat an Arena with a gold star. Win all 3 matches in that arena and youll get a medapart and a medal. Some medals can only be found in the rokusho version like the phoniex medal. But you can only get the bomb medal in the metabee version. As in, its only in that version. there are other medals around!